'Angles opposite' diaporamas de présentation

Math 3301 Foundations of Geometry

Math 3301 Foundations of Geometry. Chapter 2 Triangles Dr. Geoff F. Clement. 2.1 Classifying Triangles.

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Warm Up

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Special Right Triangles

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Special Right Triangles

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FINAL EXAM REVIEW

FINAL EXAM REVIEW. Chapter 4 Key Concepts. Chapter 4 Vocabulary. congruent figures corresponding parts equiangular Isosceles ? legs base vertex angle base angles. median altitude perpendicular bisector CONGRUENCE METHODS: SSS SAS ASA AAS HL.

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GEOMETRY: Chapter 4

GEOMETRY: Chapter 4. 4.6: Use Isosceles and Equilateral Triangles. Theorem 4.6: BASE ANGLES THEOREM If two sides of a triangle are congruent, then the angles opposite them are congruent. Images taken from: Geometry. McDougal Littell: Boston, 2007. P. 264.

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4.6 The Isosceles Triangle Theorems

4.6 The Isosceles Triangle Theorems. Base Angles and Opposite Sides Hypotenuse - Leg. Parts of an Isosceles Triangle. Isosceles Triangle Theorem. If two sides of a triangle are congruent, then the angles opposite those sides are congruent. . Isosceles Triangle Theorem.

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4.6 The Isosceles Triangle Theorems

4.6 The Isosceles Triangle Theorems. Base Angles and Opposite Sides Hypotenuse - Leg. Parts of an Isosceles Triangle. Isosceles Triangle Theorem. If two sides of a triangle are congruent, then the angles opposite those sides are congruent. . Isosceles Triangle Theorem.

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A Postulate for Similar Triangles

A Postulate for Similar Triangles. Lesson 7.4 Pre-AP Geometry. Lesson Focus. The focus of this lesson is a postulate for establishing when two triangles are similar. The postulate states that two triangles are similar whenever two pairs of angles are congruent. Similar Triangles.

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Section 3.7 Angle-Side Theorems

Section 3.7 Angle-Side Theorems. By: Kellan Hirschler and Katherine Rosencrance. Theorem 20: If two sides of a triangle are congruent, the angles opposite the sides are congruent. Symbolic form: If , then (If sides, then angles). E. Given:. Conclusion:. A. T.

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Using CPCTC and HL

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SAT questions

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4.5 Isosceles and Equilateral Triangles

4.5 Isosceles and Equilateral Triangles. Chapter 4 Congruent Triangles. 4.5 Isosceles and Equilateral Triangles. Isosceles Triangle:. Vertex Angle. Leg. Leg. Base Angles. Base. *The Base Angles are Congruent*. Isosceles Triangles. Theorem 4-3 Isosceles Triangle Theorem

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Isosceles and equilateral triangles

Isosceles and equilateral triangles. Section 4-5. Vocabulary . The congruent sides of an isosceles triangle are its legs . The third side is the base . The two congruent legs form the vertex angle . The other two angles are the base angles. Isosceles Triangle Theorem.

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4-5 Isosceles and Equilateral Triangles

4-5 Isosceles and Equilateral Triangles. Isosceles Triangles. The congruent sides of an isosceles triangle are its legs . The third side is the base . The legs form the vertex angle . The other two angles are the base angles. Isosceles Triangle Theorems.

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Angle Side Theorems

Angle Side Theorems. Lesson 3.7. Theorem 20: If two sides of a triangle are congruent, the angles opposite the sides are congruent. IF. Then. Theorem 21: If two angles of a triangle are congruent, the sides opposite the angles are congruent. If. Then.

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Section 4-4 Isosceles Triangles & Proofs

Section 4-4 Isosceles Triangles & Proofs. Review Definition of Isosceles Triangle:. A triangle with at least two sides congruent. Theorem 4-1 : If a triangle has two congruent sides, the angles opposite those sides are congruent. B. So, ? A ? ?C. A. C. PROOF OF THEOREM 4-1 :. B.

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The Isosceles Triangles Theorems

The Isosceles Triangles Theorems. Section 4-6. Isosceles Triangle Theorem. If 2 sides of a triangle are congruent, then the angles opposite those sides are congruent. 8. 8. 50. 50. Theorem 4-10. If 2 angles of a triangle are congruent, then the sides opposite those angles are congruent.

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Lesson 4-6

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Lesson 3-2

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